Can we support UDP in addr test

[weakiwi]

Describe the feature:
Addr resource support udp address
Describe the solution you'd like
specify Localaddr network type by user or according to target

Describe alternatives you've considered
https://github.com/aelsabbahy/goss/blob/6abda7e83d9d35129f37278ef5ba8cf864b8be95/system/addr.go#L43 In this line, localaddr use TCPAddr. According to offical docs https://golang.org/pkg/net/#Dialer, LocalAddr should be of a compatible type for the network being dialed

[aelsabbahy]

released